Methods and devices for detecting intensity of light with translucent detector

A method of determining a physiological parameter using an optical measurement device, the method comprising:

• causing a light source to emit light, wherein a translucent detector positioned along a light path between the light source and a measurement site detects incident light emitted by the light source as it emerges from the light source, wherein at least some light emitted by the light source passes through a portion of the translucent detector prior to reaching the measurement site;
• detecting, using the translucent detector, attenuated light, the attenuated light having been attenuated by the measurement site;
• receiving, using one or more hardware processors, a first signal generated by the translucent detector, the first signal corresponding to the detected incident light;
• receiving, using the one or more hardware processors, a second signal generated by the translucent detector, the second signal corresponding to the detected attenuated light;
• and
• determining, using the one or more hardware processor, a physiological parameter based at least in part on the first signal and second signal.